Did you set the flow rate of the control zone terminal unit to 0? If so, this is causing the warning. Set it to some other small value, but not too small since the control zone fraction is used to determine the total load on the unitary system coils.
Total Load (W) = control zone load (W) / control zone fraction.
You should also notice by this equation that if the control zone load is always 0 (thermostat never calculates a cooling or heating load), then the coils should not turn on. So yes that is one way to get only ventilation air if the fan is set to "constant fan mode". If the fan is set to "cycling fan mode" then the fan will never turn on.
Another way would be to use the coil availability schedules to schedule the coils off all year.
On 6/4/2011 12:35 AM, Vinay Devanathan wrote:
Richard,
Thanks for your reply.
I have a Unitary System with multiple zones served by it. I am using this airloop mainly for ventilation purposes and have a separate system for space conditioning. In order to not utilize heating/cooling coils energy while providing ventilation air, I set the controlling zone to a zone that does not require conditioning at all. I assume that this is the reason the error is caused. Could you please say what you think is the best possible way to achieve what I want to do?
Thanks again.
On Fri, Jun 3, 2011 at 7:20 AM, Richard Raustad <RRaustad@xxxxxxxxxxxx> wrote:
The Fraction of Supply Air Flow That Goes Through the Controlling Zone is automatically calculated by the program. It means that the thermostat zone, the zone that is defined in the input, provides all the air (fraction of air to the control zone divided by the total air flow rate through the heat pump). If you have more than 1 zone (or air terminal) on this air loop, then this air loop is not set up correctly. If you do only have 1 zone for this air loop, then this warning is a mistake and should probably not be written to the error file. If you do only have 1 zone, send your input file to energyplus-support@xxxxxxxx.
On 6/2/2011 10:32 PM, Vinay Devanathan wrote:Hello,Why would I get an error saying -"The Fraction of Supply Air Flow That Goes Through the Controlling Zone is set to 1"when there is no input like this in the definition of an Unitary Heat Pump : Air To Air object.Any assistance would be greatly appreciated.
Thank you.Vinay
-- Richard A. Raustad Senior Research Engineer Florida Solar Energy Center University of Central Florida 1679 Clearlake Road Cocoa, FL 32922-5703 Phone: (321) 638-1454 Fax: (321) 638-1439 or 1010 Visit our web site at: http://www.fsec.ucf.edu UCF - From Promise to Prominence: Celebrating 40 Years
-- Richard A. Raustad Senior Research Engineer Florida Solar Energy Center University of Central Florida 1679 Clearlake Road Cocoa, FL 32922-5703 Phone: (321) 638-1454 Fax: (321) 638-1439 or 1010 Visit our web site at: http://www.fsec.ucf.edu UCF - From Promise to Prominence: Celebrating 40 Years
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